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\"If computers are to become smart enough to design their own successors, initiating a process that will lead to God-like omniscience after a number of ever swifter passages from one generation of computers to the next, someone is going to have to write the software that gets the process going, and humans have given absolutely no evidence of being able to write such software.\" -Jaron Lanier

You're trying to learn how to hack but you don't know that 4 bytes is an integer?!?!? Signed or unsigned is a matter of interpretation.. The thing to watch out for is little or big endian.. I'll leave it up to you to find the difference between them

Oliver's Law:
Experience is something you don't get until just after you need it.

]jk[, let me give you an advice: ask yourself what is your goal?
Do you want to pass level 0 "to pass level 0", "to learn
basic networking and byte representation of data" or
"to learn how to gather information"? Or even something else?

If you just want to pass, a few people here could give you the
solution immediately, however, you will be lost at level 1 again.

If you want to learn about basic networking and byte representation,
that's great. You already now the basic networking part, so
let me give you a reader[1], which should help you to solve the
problem: learn, how an integer is represented in the memory,
and why people here are talking about the "order". Learn,
what "memory" actually is.

In my opinion, the highest achievement you can make during
this wargame is to learn how to gather information by yourself -
independently. Analyse what you know, what you will have to
know, and learn. This is not simple, but the more you practise
it, the better you become. This wargame starts simple, so use
this opportunity